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Tail currents of heteromeric KCNQ1/KCNE1 channels were measured after various prepulse durations, tp. Example traces are shown in A (tp= 0.5 s) and B (tp= 2 s). Normalised instantaneous I-V relations are shown in C for various tp values. The intracellular solution contained 65 mm Na+. Qualitatively very similar results were obtained in a total of 4 cells.
